package com.sun.aspect;

import com.sun.annotation.AutoFill;
import com.sun.constant.AutoFillConstant;
import com.sun.context.BaseContext;
import com.sun.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类,实现公共字段填充处理逻辑
 */
@Slf4j
@Aspect
@Component
public class AutoFillAspect {

    /**
     * 公共切入点
     */
    @Pointcut("execution(* com.sun.mapper.*.*(..)) && @annotation(com.sun.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知: 在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFil(JoinPoint joinPoint){
        log.info("开始进行公共字段填充.....");

        // 获取到当前拦截的方法上的数据操作类型 新增(INSERT) 修改(UPDATE)
        // 方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        // 获取方法上的注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        // 获取数据库的操作
        OperationType operationType = autoFill.value();

        // 获取到当前被拦截的方法参数 - 实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }

        Object entity = args[0];//employeeDTO

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 根据当前不同的操作类型,给对应的属性通过反射来进行做赋值操作
        if (operationType == OperationType.INSERT){
            // 给4个公共字段进行填充
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class
                );

                // 通过反射给对象属性赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE){
            // 给2个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射给对象属性赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }

        }

    }
}
